Seattle to San Diego — sea route & marine weather
The sea route from Seattle (USSEA) to San Diego (USSAN) is about 1,307 nm — about 5 days at 10 kn. Along the route today (Aug 3): NNW wind 0–29 kn, waves 1.1–3.7 m. The baseline track is drawn on the chart; Calculate replans it for your vessel and live weather.
Passage facts| Sea-route distance | 1,307 nm |
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| Passage time at 10 kn | about 5 days |
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| Great-circle distance | 924 nm |
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| Seattle | 47°36.0′N 122°20.0′W |
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| San Diego | 32°42.0′N 117°9.0′W |
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| Reference vessel | 4.5 m draft, 10 kn cruise |
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10-day marine forecast — along the route
| Date | Wind | Gusts | Waves |
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| NNW 0–29 kn | 40 kn | 1.1–3.7 m |
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| N 1–28 kn | 39 kn | 1.0–3.5 m |
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| N 0–24 kn | 31 kn | 0.8–2.8 m |
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| N 0–17 kn | 22 kn | 0.8–1.8 m |
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| SSW 1–18 kn | 23 kn | 0.7–1.6 m |
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| WSW 0–22 kn | 28 kn | 0.8–2.0 m |
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| WSW 1–25 kn | 31 kn | 0.9–3.0 m |
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| E 1–28 kn | 37 kn | 0.9–3.2 m |
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| ENE 1–27 kn | 36 kn | 0.8–3.1 m |
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| SSE 0–25 kn | 34 kn | 1.0–3.1 m |
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Forecast from the ECMWF IFS model run , waves from ECMWF WAM. Updated with each model cycle; the live chart below recalculates for your departure time and vessel.
Frequently asked
How far is it from Seattle to San Diego by sea?
The water route is 1,307 nm (2,421 km), computed on WXMarine's maritime routing network. The same distance applies on the return passage from San Diego to Seattle.
How long does the passage from Seattle to San Diego take?
about 5 days at a 10 kn cruise. Scale by your own speed: at half the speed it takes about twice as long. The planner on this page recalculates for your vessel and live weather.
What is the weather between Seattle and San Diego today?
Along the route today, per the ECMWF IFS run 2026-08-03 12z: NNW wind 0–29 kn, waves 1.1–3.7 m. The day-by-day table on this page covers the next 10 days.